Let $w, x, y, z$ be vectors and suppose $z= - x+ y$ and $w=2 x - 3 y+ 2 z$.

Mark the statements below that must be true.

A. Span(x, z)= Span(y, w)
B. Span(x, y) = Span(x, w, z)
C. Span(x, y)=Span(w)
D. Span(y) = Span(w)